- allocate clientInfo on demand
- move getMode() from JdbcDatabaseMetaData to JdbcConnection so we only
need to fetch it once per connection
- add minimal support for JdbcDatabaseMetaData#getClientInfoProperties

Fix bug where a lock on the SYS table was not released when closing a session that contained a temp table with an LOB column.

<li>Issue #255: ConcurrentModificationException with multiple threads in embedded mode and temporary LOBs

I think I've fixed this

Restores the ability of H2 in default configuration to use ssl
connections out-of-the-box.

The security property jdk.tls.legacyAlgorithms exists in newer Java
versions and its default value effectively prevents anonymous TLS
from being used. The modification is only attempted when
h2.enableAnonymousTLS is true and makes SSL server socket behaviour
during handshake more similar to that of older JREs.

Note that the setting affects all SSL server sockets on the same JVM.

Issue #156: Add support for getGeneratedKeys() when executing commands via PreparedStatement#executeBatch